Sewing

Sewing operation allows uniting several faces (possibly contained in a shell, solid or compound) into one shell. Geometrically coincident (within a specified tolerance) edges (or parts of edges) of different faces are replaced by one edge thus producing a shell of faces with shared boundaries.

This operation is similar to New Entity - > Build - > Shell operation, the difference is that with Sewing you can specify the tolerance and get a non-manifold result.

The possibility to create a non-manifold shell can be used e.g. to create a shell forming several closed domains and then to create several solids with shared boundaries from this shell.

Note

Geometrically coincident faces (or parts of faces) will not be replaced by one face during Sewing.

To produce a Sewing operation in the Main Menu select Repair - > Sewing.

The Result will be a GEOM_Object (shell).

In this dialog:

• Click on the "Arrow" button and select in the Object Browser or in the viewer one or more Shapes (faces or shells) to be sewn.
• Activate Allow Non Manifold check-box to produce non-manifold sewing, if required.
• Define precision for sewing in Tolerance field.
• Activate Detect Free boundaries button to display the number of free boundaries in the shape:
  
• Click Apply or Apply and Close button.

This operation can be also launched using a TUI Command:

geompy.MakeSewing(ListOfShape, Precision, AllowNonManifold=False),

where ListOfShape is a list of faces or shells to be sewn, Precision is a precision for sewing, AllowNonManifold is a flag that allows non-manifold sewing.

Example:

The initial faces

The sewn faces

Our TUI Scripts provide you with useful examples of the use of Repairing Operations.